Suppose you had used 4.00 grams of NaOH(s) in Reaction 1. What would have been the number of Joules released in the reaction? What effect would this have on the value of X1?

1)isothermic,exothermic, or endothermic 2)combustion,descombotion,synthesis,acid-base,double replacement,or single replacement

A tiny sample of an aqueous solution of two substances R and P is sketched below, as if it was under an imaginary microscope so powerful that individual molecules could be seen. (The water molecules are not shown.) 8 R and P can interconvert. That is, R can turn into P, and P can turn back into R: 113 5 R (aq)=P(aq) R P number of R molecules: number of P molecules: K= The equilibrium constant K for this equilibrium is interconversion reaches equilibrium. $3/1₁ Predict the number of R and P molecules in this sample when the . X

One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chloride anions in solution will combine with the silver cations to produce bright white silver chloride precipitate. Suppose an EPA chemist tests a 200.mL sample of groundwater known to be contaminated with iron(III) chloride, which would react with silver nitrate solution like this: FeCl3 (aq) + 3AgNO3 (aq) →3AgCl (s) + (FeNO3)3 (aq) The chemist adds 48.0mM silver nitrate solution to the sample until silver chloride stops forming. She then washes, dries, and weighs the precipitate. She finds she has collected 7.5mg of silver chloride. Calculate the concentration of iron(III) chloride contaminant in the original groundwater sample. Be sure your answer has the correct number of significant digits.

= (1) H H H H (2) (3)

Can you explain plz?

This question is a bit complicated but please help me to fill it out and answer it. It would mean a lot, thank you.

Which reaction would it be possible to calculate (Triangle H)?

6. Write the expression for Kc for the following reactions. In each case indicate whether the reaction is homogeneous or heterogeneous. a. CH4 (g) + H2S (g) → CS2(g) + H2 (g) HF + F¯ (aq) b. (aq) ⇒ H* (aq) c. Ti (s) + Cl2 (g) → TiCl4 (1) d. HCI (aq) + O2 (g) → H₂O (1) + 2 Cl2 (g)

Br2(at)+2NaI(aq) --> 2NaBr(aq)+I2(aq) Cl2(aq)+2NaBr(aq) --> NaCl(aq)+Br2 Which of the three halogens would you predict is the most stable, upon mixing with other halogens? Justify your answer.